List of top Physics Questions

A 200 J of work is done in moving a charge 5C from a point A where the potential is - 20 V to another point B where potential is V volt. The value of V at B is

An electric dipole of dipole moment \(\vec{P}\) is placed in the uniform electric field \(\vec{E}\). Then which of the following statements are correct?
Statement I: The torque on the dipole is \(\vec{P} \times \vec{E}\)
Statement II: The potential energy of the dipole is \(-\vec{P} \cdot \vec{E}\)
Statement III: The net force on the dipole is non zero

In the circuit shown in the figure, the potential difference across the 4\(\mu\)F capacitor is

A parallel plate capacitor has a uniform electric field 'E' in the space between the plates. If the distance between the plates is 'd' and area of each plate is 'A', the energy stored in the capacitor is

Consider three point charges \(-2Q, Q\) and \(-Q\) and three surfaces S\(_1\), S\(_2\) and S\(_3\) as shown in the figure. Match the entries of List-I with that of List-II.

List-I
(a) Net flux through S\(_1\)
(b) Net flux through S\(_2\)
(c) Net flux through S\(_3\)
List-II
(i) \(\frac{-2Q}{\epsilon_0}\)
(ii) \(\frac{-Q}{\epsilon_0}\)
(iii) Zero
Codes:

What will be the total electric flux through the faces of the cube as given in the figure with side of length 'a' if a charge Q is placed at B, midpoint of an edge of the cube (see figure)?

A wire of resistance \(R\) is stretched to double its original length. What is its new resistance?

A capacitor of \(10\,\mu F\) is charged to \(50\,V\). Calculate the energy stored in the capacitor.

A charged particle moves in a magnetic field \(B\) with velocity components both along and perpendicular to \(B\). What is its path?

A body of mass \(10\,\text{kg}\) is moving with a velocity of \(20\,\text{m/s}\). What is the kinetic energy?

A ball is dropped from a height of \(20\,\text{m}\). What is its velocity just before hitting the ground?

The INCORRECT statement is

The optical elements are matched with their optical phenomenon. The FALSE match is

Identify the two electromagnetic waves A and B having respective wavelengths 2 cm and 580 nm

If a thin lens of focal length 20 cm is in contact with another lens of power 4 D, then the effective power of the combination is

Nucleons in nucleus are bound by

In an electric circuit, if 2A , 5 A and 4 A are the currents entering a junction and Ix , 2A and 3A are the currents leaving the junction, then the current value Ix is

The current that has to pass through a single circular loop of radius 10 cm to produce a magnetic field of \(\mu_0\) tesla at its centre is

If three tube lights with power 10 W, 25 W and 50 W are connected in parallel to a source voltage V, then the effective power of the combination is

As temperature increases, at Curie temperature

In a transformer circuit it is possible to

If n electrons from a neutral solid sphere are transferred to another solid sphere having m electrons (m $>$ n), then the charges on the respective spheres are (e = charge of an electron)

When a tuning fork of frequency 256 Hz is sounded together with unknown tuning fork, 4 beats are heard in one second. The frequency of the unknown tuning fork can be

An isolated capacitor of capacitance 100 \(\mu\)F is charged to 32 C. If 16 C of charge is discharged from it, then its capacitance value is

The magnitude and direction of acceleration change in the case of an object